. Author manuscript; available in PMC: 2010 May 1.

Published in final edited form as: J Electron Spectros Relat Phenomena. 2009 May 1;172(1-3):2–8. doi: 10.1016/j.elspec.2009.02.008

Table 4.

ToF-SIMS peak intensity ratios for selected oxygen containing peaks detected on NH₂- and CH₃-SAMs.^*

Ion	Mass	RATIO NH₂-SAM/CH₃-SAM
O⁻	15.995	6.7
OH⁻	17.0029	3.2
CHO⁻	29.0034	7.9
C₂O⁻	39.9959	6.5
C₂HO⁻	41.0043	5.9
CNO⁻	41.9999	30.5
CHNO⁻	43.0027	29.5
C₂HO⁻	43.0207	4.6
CO₂⁻	43.9917	3.2
CHO₂⁻	45.0002	6.2
SO⁻	47.9702	2.5
SOH⁻	48.9777	1.9
H₂O₃⁻	50.0045	13.2
C₃O⁻	51.9977	8.4
C₃HO⁻	53.0055	6.0
C₃H₃O⁻	55.0223	10.2
C₃H₅O⁻	57.038	6.7
CHSO⁻	60.9778	3.2
SO₂⁻	63.9656	2.0
SO₃⁻	79.9625	2.7
SO₄⁻	95.9617	0.8
S₂O₃⁻	111.9358	2.6
AuSO⁻	244.9287	1.3
H₃O⁺	19.0185	3.4
CHO⁺	29.0027	5.1
CH₃O⁺	31.0191	5.4
C₂H₂O⁺	42.008	2.2
CH₂NO⁺	44.0144	7.7
CH₄NO⁺	46.029	40.3
C₃H₃O⁺	55.0317	2.7
C₂H₆NO⁺	60.046	16.5
SO₂H⁺	64.9708	1.8
H₂SO₄⁺	97.9758	5.5

Intensities for each peak were normalized to the total intensity of the corresponding spectrum. Ratios presented here are calculated from average normalized peak intensities taken from five different spots on three samples of each SAM.